Why the disabled button is not getting enabled using the jquery?

Question

I have an asp.net button rendered as

ctl00_ContentPlaceHolder1_TabContainer1_tpAllocate_btnNewInvoiceFalse

this is the ID.

Now in jquery in console of inspect element, I am writing.

$("#ctl00_ContentPlaceHolder1_TabContainer1_tpAllocate_btnNewInvoiceFalse").prop("disabled",false)

Not working.

then I tried

$("#ctl00_ContentPlaceHolder1_TabContainer1_tpAllocate_btnNewInvoiceFalse").removeAttr('disabled');

but not working.